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\title{About the Scherk Surface with Handle}
\author{H. Karcher}
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\maketitle


 This surface is a genus one version of Scherk's doubly-periodic
surface. Existence and embeddedness is proved in [KWH], and our
formulas are from there.

   The conjugate fundamental domain is bounded by straight lines.
This piece can be rotated to be a graph over a convex domain, and
in this position the original piece is also a graph.  For this we
suggest the associate family morphing.

   The surface has a period problem, because the position of the
punctures is not determined on the square torus by qualitative
considerations. We suggest the (joint) position of the punctures
as morphing parameter (ee), again to illustrate the use of
intermediate value arguments for killing periods.

  For a discussion of techniques for creating minimal surfaces with
various qualitative features by appropriate choices of Weierstrass
data, see either [KWH], or pages 192--217 of [DHKW].

[KWH]  H. Karcher, F. Wei, and D. Hoffman, The genus one helicoid, and
         the minimal surfaces that led to its discovery, in ``Global Analysis
         in Modern Mathematics, A Symposium in Honor of Richard Palais'
         Sixtieth Birthday'', K. Uhlenbeck Editor, Publish or Perish Press, 1993

[DHKW] U. Dierkes, S. Hildebrand, A. Kuster, and O. Wohlrab,
           Minimal Surfaces I, Grundlehren der math. Wiss. v. 295
           Springer-Verlag, 1991

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